Uninterruptible Power Supply (UPS) is a type of power supply system that contains a battery to maintain power to provide power to electronics in the event of a power surge or outage. In other words, UPS is a device that is able to supply power to electrical equipment during a power outage for a certain amount of time. Depending on the type and size of the system, the maximum backup time needed varies. Large professional data centre systems are usually dimensioned so that the power supply is assured until petrol or diesel emergency generators have time to kick in. Some systems provide the equipment with power for the time it takes them to shut down.
A commercial UPS is typically used to protect hardware such as computers, data centers, telecommunication equipment or other electrical equipment where an unexpected power disruption could cause injuries, fatalities, serious business disruption or data loss. General usage areas of UPS are power plants, conventional power generation, oil & gas industry, water/wastewater industry, nuclear industry, mining industry, power transmission and distribution industries, naval platforms, telecommunication centers, marine and land transport vehicles, hospitals, conventional power generation, military facilities and similar applications.
Simples defination of UPS, the critical loads is affected by voltage fluctuations (Peaks, distortions, instant voltage changes), harmonics, and short or long-term interruptions in the mains. The UPS system filters these fluctuations in the mains and makes the critical load unaffected. The critical load is supplied with pure energy which is fixed all kind of fluctions from mains thanks to the UPS. In this way, The critical devices at the load output are supplied with high quality energy, and malfunctions due to irregularities in the mains are prevented with the UPS. This operation extends the service life of the critical devices.
UPSs can be classified in terms of their structure as following;
UPSs can be classified in terms of operation as following;
- On-Line UPS
- Off-Line UPS
- Line-Interactive UPS